US8446056B2 - Electric machine cooling system and method - Google Patents

Electric machine cooling system and method Download PDF

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Publication number
US8446056B2
US8446056B2 US12/893,698 US89369810A US8446056B2 US 8446056 B2 US8446056 B2 US 8446056B2 US 89369810 A US89369810 A US 89369810A US 8446056 B2 US8446056 B2 US 8446056B2
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United States
Prior art keywords
stator
electric machine
coolant
housing
inner diameter
Prior art date
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Active, expires
Application number
US12/893,698
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English (en)
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US20120074799A1 (en
Inventor
Michael D. Bradfield
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BorgWarner Inc
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Remy Technologies LLC
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Priority to US12/893,698 priority Critical patent/US8446056B2/en
Application filed by Remy Technologies LLC filed Critical Remy Technologies LLC
Assigned to REMY TECHNOLOGIES, LLC reassignment REMY TECHNOLOGIES, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRADFIELD, MICHAEL D.
Assigned to BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT reassignment BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT GRANT OF PATENT SECURITY INTEREST Assignors: REMY TECHNOLOGIES, L.L.C.
Assigned to WELLS FARGO CAPITAL FINANCE, LLC, AS AGENT reassignment WELLS FARGO CAPITAL FINANCE, LLC, AS AGENT SECURITY AGREEMENT Assignors: REMY POWER PRODUCTS, LLC, REMY TECHNOLOGIES, L.L.C.
Priority to DE112011103336T priority patent/DE112011103336T5/de
Priority to CN2011800470891A priority patent/CN103141015A/zh
Priority to KR1020137010418A priority patent/KR20130114147A/ko
Priority to PCT/US2011/052115 priority patent/WO2012050741A2/fr
Publication of US20120074799A1 publication Critical patent/US20120074799A1/en
Publication of US8446056B2 publication Critical patent/US8446056B2/en
Application granted granted Critical
Assigned to REMY TECHNOLOGIES, L.L.C. reassignment REMY TECHNOLOGIES, L.L.C. RELEASE OF SECURITY INTEREST IN PATENTS PREVIOUSLY RECORDED AT REEL/FRAME 025521/0387 Assignors: BANK OF AMERICA, N.A.
Assigned to REMY TECHNOLOGIES, L.L.C., REMY POWER PRODUCTS, L.L.C. reassignment REMY TECHNOLOGIES, L.L.C. RELEASE OF SECURITY INTEREST IN PATENTS PREVIOUSLY RECORDED AT REEL/FRAME 025525/0186 Assignors: WELLS FARGO CAPITAL FINANCE, L.L.C.
Assigned to BORGWARNER INC. reassignment BORGWARNER INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: REMY TECHNOLOGIES, L.L.C.
Active legal-status Critical Current
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/15—Mounting arrangements for bearing-shields or end plates
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/20—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil wherein the cooling medium vaporises within the machine casing

Definitions

  • Conventional oil-cooled electric machine modules include a steel canister into which an electric machine is mounted.
  • the steel canister in turn is mounted into a cast aluminum housing.
  • the holes often point toward stator end turns of the electric machine so that the oil sprays on each stator end turn. By gravity, the oil then flows down to a drain around the bottom of the electric machine.
  • an electric machine module including an electric machine with a stator and a housing at least partially circumscribing the electric machine.
  • the housing includes at least two housing members coupled together and substantially securing the electric machine within the housing.
  • the electric machine module can also include a coolant jacket at least partially defined by an outer diameter of the stator and an inner diameter portion of the housing.
  • an electric machine module including an electric machine with a stator and a housing at least partially circumscribing the electric machine.
  • the housing includes at least two housing members coupled together and substantially securing the electric machine within the housing.
  • the housing also includes indentations positioned near axial ends of the stator and substantially along a circumference of the stator. The indentations provide an axial flow path substantially following a portion of an outer diameter of the stator and a radial flow path substantially following a portion of an axial side of the stator.
  • the method may include providing an electric machine including a stator with stator end turns and providing a housing defining a machine cavity and at least partially circumscribing the electric machine.
  • the housing can include at least two housing members coupled together, where at least one of the at least two housing members can include a coolant inlet and a coolant passageway.
  • the method can also include providing a coolant jacket at least partially defined by an outer diameter of the stator and an inner diameter portion of the housing and positioning a plurality of apertures substantially circumferentially around the coolant jacket.
  • the coolant passageway can fluidly connect the coolant inlet and the coolant jacket, and the plurality of apertures can be in fluid communication with at least the machine cavity and the coolant jacket.
  • the method can further include introducing a coolant into the coolant inlet, circulating the coolant through the coolant passageway and into the coolant jacket, and forcing at least a portion of the coolant through the plurality of apertures into the machine cavity.
  • FIG. 1 is a front cross-sectional view of an electric machine module according to one embodiment of the invention.
  • FIG. 2A is a side cross-sectional view of the electric machine module of FIG. 1 .
  • FIG. 2B is a partial front cross-sectional view of the electric machine module of FIG. 2 along line segment A-A.
  • FIG. 2C is a partial front cross-sectional view of the electric machine module of FIG. 2 along line segment B-B.
  • FIG. 2D is a partial front cross-sectional view of the electric machine module of FIG. 2 along line segment C-C.
  • FIG. 1 illustrates a portion of an electric machine module 10 according to one embodiment of the invention.
  • the electric machine module 10 can include a housing 12 comprising a first housing member 14 and a second housing member 16 . In some embodiments, more than two housing members can be employed (not shown).
  • An electric machine 18 can be housed within a machine cavity 20 at least partially defined by the housing members 14 , 16 .
  • the housing 12 can at least partially circumscribe the electric machine 18 .
  • the housing members 14 , 16 can be coupled via one or more fasteners (not shown) or another suitable coupling manner, to enclose the electric machine 18 within the machine cavity 20 .
  • the housing members 14 , 16 can comprise cast aluminum.
  • the housing members 14 , 16 can be portions of a transmission housing (not shown).
  • the electric machine 18 can include a rotor 22 , a stator 24 , stator end turns 26 , and bearings 28 , and can be disposed about a main output shaft 30 .
  • the stator 24 can circumscribe the rotor 22 , and a radial air gap 31 can exist between the rotor 22 and the stator 24 .
  • the electric machine 18 also can include a rotor hub 32 or can have a “hub-less” design (not shown).
  • the electric machine 18 can be, without limitation, an electric motor, such as a hybrid electric motor, an electric generator, or a vehicle alternator.
  • the electric machine 18 can be an induction belt-alternator-starter (BAS).
  • the electric machine 18 can be a High Voltage Hairpin (HVH) electric motor for use in a hybrid vehicle.
  • HVH High Voltage Hairpin
  • Components of the electric machine 18 such as, but not limited to, the stator 24 , the stator end turns 26 and the rotor 22 can generate heat during operation of the electric machine 18 . These components can be cooled to enhance the performance of and increase the lifespan of the electric machine 18 .
  • the electric machine module 10 can include a coolant jacket 34 .
  • a portion of the coolant jacket 34 can be cast into each housing member 14 , 16 .
  • the coolant jacket 34 can be formed between an outer diameter of the stator 24 and inner diameter portions of the housing members 14 , 16 .
  • a coolant such as motor oil, hydraulic fluid oil, or a similar fluid can be circulated through the coolant jacket 34 to help cool the stator 24 .
  • forming the coolant jacket 34 using the stator and the housing members 14 , 16 can eliminate the need for a separate canister or sleeve member, as is used in some conventional electric machine modules.
  • the coolant can be introduced into the coolant jacket 34 through a coolant passageway 36 . More specifically, the coolant passageway 36 can fluidly connect the coolant jacket 34 with a coolant inlet 38 .
  • the coolant passageway 36 and the coolant inlet 38 can be integral with one of the housing members 14 , 16 .
  • the coolant passageway 36 and the coolant inlet 38 can be formed within the first housing member 14 .
  • the coolant inlet 38 can be in fluid communication with a fluid source via a conventional connection hose or similar (not shown).
  • the housing members 14 , 16 can have substantially equal axial lengths. As a result, the housing members 14 , 16 can be coupled together near a central point along an axial length the stator 24 . In other embodiments, the housing members 14 , 16 can have different axial lengths. The housing members 14 , 16 , can be coupled at the central point or different points along the axial length of the stator 24 so that both the housing members 14 , 16 can form the coolant jacket 34 with the stator. The housing members 14 , 16 can each be press-fit or friction-fit against axial ends and/or axial sides of the stator 24 , as shown in FIG.
  • the housing members 14 , 16 can have a first inner diameter 40 that is smaller than the outer diameter of the stator 24 (e.g., forming an inner wall inside the machine cavity 20 ), a second inner diameter 42 substantially equal to the outer diameter of the stator 24 (e.g., substantially forming the seal between the coolant jacket 34 and the machine cavity 20 ), and a third inner diameter 44 larger than the outer diameter of the stator 24 (e.g., forming a wall of the coolant jacket 34 ).
  • an o-ring 46 can be positioned to provide a seal between the housing members 14 , 16 so that the coolant inside the coolant jacket 34 is substantially prevented from leaking outside the housing 12 .
  • the housing members 14 , 16 can include a plurality of cast indentations 47 positioned at axial ends of the coolant jacket 34 , as shown in FIGS. 1 , 2 A, and 2 D.
  • the indentations 47 can provide a plurality of spray slots or apertures 48 between the housing members 14 , 16 and the stator 24 when the electric machine 18 is positioned within the housing 12 .
  • the plurality of apertures 48 can be positioned circumferentially around the coolant jacket 34 . As shown in FIGS.
  • each of the plurality of apertures 48 can extend axially from the coolant jacket 34 along outer edges of the stator 24 and then radially inward to permit fluid communication between the coolant jacket 34 and the machine cavity 20 . Due to the radially-inward turn in each of the plurality of apertures 48 , the coolant flowing through the apertures 48 can be dispersed onto or near the stator end turns 26 in order to help cool the stator end turns 26 . Due to the 90-degree bend in the radially-inward turn of each of the plurality of apertures 48 , the pressure drop across the plurality of apertures 48 can be much higher than straight apertures or slots. As a result, the housing 12 can include more apertures 48 to more evenly cool the stator end turns 26 , compared to housings with straight apertures.
  • the coolant can be dispersed into the coolant jacket 34 through the coolant inlet 38 and the coolant passageway 36 .
  • the coolant can split into two flows and flow circumferentially around the coolant jacket 34 to help cool the stator 24 .
  • At least a portion of the coolant can exit from the coolant jacket 34 by being forced (i.e., by fluid pressure within the coolant jacket 34 ) through the apertures 48 and spray onto or near the stator end turns 26 to help cool the stator end turns 26 .
  • the coolant can flow toward a bottom of the machine cavity 20 due to gravity, cooling the electric machine components such as, but not limited to, the rotor 22 , the stator 24 , the rotor hub 32 , and the bearings 28 as it flows downward.
  • a drain (not shown) can be positioned near the bottom of the machine cavity 20 to expel the coolant back to the fluid source where it can be cooled and circulated back to the coolant jacket 34 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Motor Or Generator Cooling System (AREA)
US12/893,698 2010-09-29 2010-09-29 Electric machine cooling system and method Active 2030-12-10 US8446056B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US12/893,698 US8446056B2 (en) 2010-09-29 2010-09-29 Electric machine cooling system and method
PCT/US2011/052115 WO2012050741A2 (fr) 2010-09-29 2011-09-19 Système et procédé de refroidissement de machine électrique
DE112011103336T DE112011103336T5 (de) 2010-09-29 2011-09-19 Kühlsystem und -Verfahren für Elektromaschinen
KR1020137010418A KR20130114147A (ko) 2010-09-29 2011-09-19 전기 기계 냉각 시스템 및 방법
CN2011800470891A CN103141015A (zh) 2010-09-29 2011-09-19 电机冷却系统和方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/893,698 US8446056B2 (en) 2010-09-29 2010-09-29 Electric machine cooling system and method

Publications (2)

Publication Number Publication Date
US20120074799A1 US20120074799A1 (en) 2012-03-29
US8446056B2 true US8446056B2 (en) 2013-05-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
US12/893,698 Active 2030-12-10 US8446056B2 (en) 2010-09-29 2010-09-29 Electric machine cooling system and method

Country Status (5)

Country Link
US (1) US8446056B2 (fr)
KR (1) KR20130114147A (fr)
CN (1) CN103141015A (fr)
DE (1) DE112011103336T5 (fr)
WO (1) WO2012050741A2 (fr)

Cited By (6)

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US20120133222A1 (en) * 2010-11-29 2012-05-31 Seungdo Han Electric vehicle using electric motor and electric motor
US20130002067A1 (en) * 2011-06-30 2013-01-03 Bradfield Michael D Electric Machine Module Cooling System and Method
US20130026887A1 (en) * 2011-07-26 2013-01-31 Sanyo Denki Co., Ltd. Electric apparatus with stator core
US10404140B2 (en) * 2016-10-24 2019-09-03 Hyundai Motor Company Cooling structure of drive motor
US20220209617A1 (en) * 2020-12-30 2022-06-30 Dana Heavy Vehicle Systems Group, Llc Systems and method for an electric motor with molded coolant jacket and spray ring
US20220320922A1 (en) * 2019-06-03 2022-10-06 Valeo Equipements Electriques Moteur Rotating electric machine provided with a cooling chamber

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US8121742B2 (en) 2007-11-08 2012-02-21 Flohr Daniel P Methods, circuits, and computer program products for generation following load management
US20100179705A1 (en) * 2009-01-14 2010-07-15 Sequentric Energy Systems, Llc Methods, circuits, water heaters, and computer program products for remote management of separate heating elements in storage water heaters
US8938311B2 (en) 2007-11-29 2015-01-20 Daniel P. Flohr Methods of remotely managing water heating units in a water heater
US20140015355A1 (en) * 2012-07-12 2014-01-16 Deere & Company Electric Machine Cooling Arrangement And Method
US9006943B2 (en) 2012-09-12 2015-04-14 Remy Technologies, L.L.C. Electro-dynamic machine with coolant chargeable bladder
US8897632B2 (en) 2012-10-17 2014-11-25 Daniel P. Flohr Methods of remotely managing water heating units in a water heater and related water heaters
US20140167559A1 (en) * 2012-12-14 2014-06-19 Deere & Company Electric machine stator securing method
US9537375B2 (en) 2013-05-10 2017-01-03 General Electric Company Thermal conductor for use in an electric machine and method of forming the same
CN105099056B (zh) * 2014-05-19 2018-09-11 珠海格力电器股份有限公司 电机结构及压缩机
DE202015105246U1 (de) * 2015-10-05 2017-01-09 Ebm-Papst St. Georgen Gmbh & Co. Kg Elektromotor mit einer Steuerelektronik
US12368332B2 (en) * 2019-01-16 2025-07-22 Borgwarner Inc. Integrated stator cooling jacket system
WO2020150089A1 (fr) 2019-01-16 2020-07-23 Borgwarner Inc. Système de chemise de refroidissement à stator intégré
EP3739728B1 (fr) * 2019-05-13 2026-05-06 CIMOS d.d. Boîtier de stator en deux parties
CN114556752B (zh) 2019-11-02 2024-07-12 博格华纳公司 具有提高效率的驱动模块
US11606005B2 (en) * 2020-04-28 2023-03-14 GM Global Technology Operations LLC Rotor end ring with oil jacket
CN114172307A (zh) * 2020-09-11 2022-03-11 法雷奥动力总成(上海)有限公司 旋转电机、动力传动系统和电动车
CN113595313B (zh) * 2021-08-05 2022-11-25 南京航空航天大学 一种具有绕组端部高效冷却能力的油冷电机
US12009723B2 (en) * 2021-09-21 2024-06-11 Dana Automotive Systems Group, Llc Electric motor with water jacket and oil-cooled stator and method for operation of the electric motor
US12088149B2 (en) 2021-12-02 2024-09-10 Borgwarner Inc. Cooling system for an electric machine
CN120883318A (zh) 2022-12-21 2025-10-31 威格电气设备股份有限公司 旋转电机壳体
DE102023207899A1 (de) * 2023-08-17 2025-02-20 Magna powertrain gmbh & co kg Elektrische Maschine mit einer Ölkühlung

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WO2012050741A3 (fr) 2012-06-14
KR20130114147A (ko) 2013-10-16
WO2012050741A2 (fr) 2012-04-19
US20120074799A1 (en) 2012-03-29
CN103141015A (zh) 2013-06-05

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